From 4aca07f730ee34a1c9bfa3cf671d95ebb77d8603 Mon Sep 17 00:00:00 2001
From: Thorsten Lockert <tholo@cvs.openbsd.org>
Date: Mon, 28 Oct 1996 02:55:06 +0000
Subject: Don't strip off the last slash in the pathname "/".  cp used to stat
 the pathname "" in order to decide that the pathname "/" is a directory. 
 This caused `cp kernel /' to fail if the kernel has the POSIX behaviour of
 not allowing the pathname "" to be an alias for ".".  It presumably also
 caused `cp /etc/motd /' to fail in the unlikely event that "." is not
 stat'able.

Be more careful about concatenating pathnames: don't check that
the pathname fits until prefixes have been discarded (the check
was too strict).  Print the final pathname in error messages.
Terminate the target directory name properly for error messages.
Don't add a slash between components if there is already a slash.

Fix from FreeBSD
---
 bin/cp/cp.c | 35 ++++++++++++++++-------------------
 1 file changed, 16 insertions(+), 19 deletions(-)

diff --git a/bin/cp/cp.c b/bin/cp/cp.c
index e4d9df97d16..7b77747aa3e 100644
--- a/bin/cp/cp.c
+++ b/bin/cp/cp.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: cp.c,v 1.3 1996/08/02 12:40:51 deraadt Exp $	*/
+/*	$OpenBSD: cp.c,v 1.4 1996/10/28 02:55:05 tholo Exp $	*/
 /*	$NetBSD: cp.c,v 1.14 1995/09/07 06:14:51 jtc Exp $	*/
 
 /*
@@ -47,7 +47,7 @@ static char copyright[] =
 #if 0
 static char sccsid[] = "@(#)cp.c	8.5 (Berkeley) 4/29/95";
 #else
-static char rcsid[] = "$OpenBSD: cp.c,v 1.3 1996/08/02 12:40:51 deraadt Exp $";
+static char rcsid[] = "$OpenBSD: cp.c,v 1.4 1996/10/28 02:55:05 tholo Exp $";
 #endif
 #endif /* not lint */
 
@@ -84,7 +84,7 @@ static char rcsid[] = "$OpenBSD: cp.c,v 1.3 1996/08/02 12:40:51 deraadt Exp $";
 #include "extern.h"
 
 #define	STRIP_TRAILING_SLASH(p) {					\
-        while ((p).p_end > (p).p_path && (p).p_end[-1] == '/')		\
+        while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/')	\
                 *--(p).p_end = 0;					\
 }
 
@@ -257,7 +257,7 @@ copy(argv, type, fts_options)
 	FTS *ftsp;
 	FTSENT *curr;
 	int base, dne, nlen, rval;
-	char *p;
+	char *p, *target_mid;
 
 	if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL)
 		err(1, NULL);
@@ -282,14 +282,6 @@ copy(argv, type, fts_options)
                  * source name to the target name.  
                  */
 		if (type != FILE_TO_FILE) {
-			if ((curr->fts_namelen +
-			    to.target_end - to.p_path + 1) > MAXPATHLEN) {
-				warnx("%s/%s: name too long (not copied)", 
-				    to.p_path, curr->fts_name);
-				rval = 1;
-				continue;
-			}
-
 			/*
 			 * Need to remember the roots of traversals to create
 			 * correct pathnames.  If there's a directory being
@@ -321,15 +313,20 @@ copy(argv, type, fts_options)
 				} else
 					base = curr->fts_pathlen;
 
-			if (to.target_end[-1] != '/') {
-				*to.target_end = '/';
-				*(to.target_end + 1) = 0;
-			}
 			p = &curr->fts_path[base];
 			nlen = curr->fts_pathlen - base;
-
-			(void)strncat(to.target_end + 1, p, nlen);
-			to.p_end = to.target_end + nlen + 1;
+			target_mid = to.target_end;
+			if (*p != '/' && target_mid[-1] != '/')
+				*target_mid++ = '/';
+			*target_mid = 0;
+			if (target_mid - to.p_path + nlen > MAXPATHLEN) {
+				warnx("%s%s: name too long (not copied)", 
+				    to.p_path, p);
+				rval = 1;
+				continue;
+			}
+			(void)strncat(target_mid, p, nlen);
+			to.p_end = target_mid + nlen;
 			*to.p_end = 0;
 			STRIP_TRAILING_SLASH(to);
 		}
-- 
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